Split flv decoding out.

Originally committed as revision 21051 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 130 insertions, 0 deletions

diff --git a/libavcodec/flvdec.c b/libavcodec/flvdec.c
new file mode 100644
index 0000000000..9095cb6b00
--- /dev/null
+++ b/libavcodec/flvdec.c
@@ -0,0 +1,130 @@
+/*
+ * FLV decoding.
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "mpegvideo.h"
+
+void ff_flv2_decode_ac_esc(GetBitContext *gb, int *level, int *run, int *last){
+    int is11 = get_bits1(gb);
+    *last = get_bits1(gb);
+    *run = get_bits(gb, 6);
+    if(is11){
+        *level = get_sbits(gb, 11);
+    } else {
+        *level = get_sbits(gb, 7);
+    }
+}
+
+int ff_flv_decode_picture_header(MpegEncContext *s)
+{
+    int format, width, height;
+
+    /* picture header */
+    if (get_bits_long(&s->gb, 17) != 1) {
+        av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
+        return -1;
+    }
+    format = get_bits(&s->gb, 5);
+    if (format != 0 && format != 1) {
+        av_log(s->avctx, AV_LOG_ERROR, "Bad picture format\n");
+        return -1;
+    }
+    s->h263_flv = format+1;
+    s->picture_number = get_bits(&s->gb, 8); /* picture timestamp */
+    format = get_bits(&s->gb, 3);
+    switch (format) {
+    case 0:
+        width = get_bits(&s->gb, 8);
+        height = get_bits(&s->gb, 8);
+        break;
+    case 1:
+        width = get_bits(&s->gb, 16);
+        height = get_bits(&s->gb, 16);
+        break;
+    case 2:
+        width = 352;
+        height = 288;
+        break;
+    case 3:
+        width = 176;
+        height = 144;
+        break;
+    case 4:
+        width = 128;
+        height = 96;
+        break;
+    case 5:
+        width = 320;
+        height = 240;
+        break;
+    case 6:
+        width = 160;
+        height = 120;
+        break;
+    default:
+        width = height = 0;
+        break;
+    }
+    if(avcodec_check_dimensions(s->avctx, width, height))
+        return -1;
+    s->width = width;
+    s->height = height;
+
+    s->pict_type = FF_I_TYPE + get_bits(&s->gb, 2);
+    s->dropable= s->pict_type > FF_P_TYPE;
+    if (s->dropable)
+        s->pict_type = FF_P_TYPE;
+
+    skip_bits1(&s->gb); /* deblocking flag */
+    s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
+
+    s->h263_plus = 0;
+
+    s->unrestricted_mv = 1;
+    s->h263_long_vectors = 0;
+
+    /* PEI */
+    while (get_bits1(&s->gb) != 0) {
+        skip_bits(&s->gb, 8);
+    }
+    s->f_code = 1;
+
+    if(s->avctx->debug & FF_DEBUG_PICT_INFO){
+        av_log(s->avctx, AV_LOG_DEBUG, "%c esc_type:%d, qp:%d num:%d\n",
+               s->dropable ? 'D' : av_get_pict_type_char(s->pict_type), s->h263_flv-1, s->qscale, s->picture_number);
+    }
+
+    s->y_dc_scale_table=
+    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
+
+    return 0;
+}
+
+AVCodec flv_decoder = {
+    "flv",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_FLV1,
+    sizeof(MpegEncContext),
+    ff_h263_decode_init,
+    NULL,
+    ff_h263_decode_end,
+    ff_h263_decode_frame,
+    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
+    .long_name= NULL_IF_CONFIG_SMALL("Flash Video (FLV) / Sorenson Spark / Sorenson H.263"),
+    .pix_fmts= ff_pixfmt_list_420,
+};